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macOS: Restore RPATH entry for libraries linked from /usr/local/lib

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Since commit 7b19531291 (macOS: Do not pass any SDK/-isysroot to
compilers by default, 2024-11-06, v4.0.0-rc1~511^2) our default
invocation of compilers targeting macOS no longer passes `-isysroot`.
Without that, Xcode's compilers search `-L/usr/local/lib` by default
even though the macOS dynamic loader does not.  Since `/usr/local/lib`
is not a fully-implemented implicit link directory, exclude it from our
detected `CMAKE_<LANG>_IMPLICIT_LINK_LIBRARIES` so that our generators
do not suppress `RPATH` entries for dependencies in that directory.

Fixes: #26867
This commit is contained in:
Brad King
2025-04-15 13:43:03 -04:00
parent 430174e65d
commit 6e63080d39
2 changed files with 12 additions and 0 deletions
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Modules/Platform/Darwin-Initialize.cmake
+7
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@@ -292,4 +292,11 @@ if(NOT CMAKE_OSX_SYSROOT)
RESULT_VARIABLE _result
)
unset(_sdk_macosx)
list(APPEND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES_EXCLUDE
# Without -isysroot, some compiler drivers implicitly pass -L/usr/local/lib
# to the linker. Since the macOS dynamic loader does not search it by
# default, it is not a fully-implemented implicit link directory.
/usr/local/lib
)
endif()